1. If you don't climb the mountain, you don't know the height of the sky. Don't face the deep stream, I don't know the thickness of the ground. ("Xunzi") 2. On paper, I don't know how to do it. -Lu You (Song)

3. If you can't smell, if you can't smell, if you can't see, if you don't know, if you know, you won't do it. -Xun Kuang (Warring States Period)

What you hear is not as good as what you see, what you see is not as good as what you practice, and what you practice is not as good as what you distinguish with your hands. -Liu Xiang (Korea)

It is useless to wake up in your heart and talk on paper without learning from yourself. —— Yan Yuan (Qing)

6. You don't know the truth until you practice. -Wang Fuzhi (Qing)

7. After learning, it's hard to keep up. -Wei Yuan (Qing)

8. Specializing in reading also has disadvantages. Be sure to get in touch with the real society and make the books you read come alive. -Lu Xun (middle)

9. Practice is the only criterion for testing truth. -Hu Fumin